Jennifer Lopez is celebrating her 44th birthday today, and the actress/singer got quite a few shoutouts on Twitter, including a sweet one from her man and several from celebrities.

Lopez and beau Casper Smart have only been dating since 2011, but the relationship is going well, according to a “source”.

“Her birthday was so much fun and she’s still celebrating,” the source said. “Casper is fantastic and they are in a good groove right now and the kids are adorable. All is well but things have just been busy!”

Smart, who is much younger than Lopez, got quite a bit of media attention when they started dating, not least of all because it was J-Lo’s first relationship since her divorce from singer Marc Anthony. Many predicted it wouldn’t last, but Lopez has said that she’s found a best friend in Smart.

“He’s fantastic; he’s like my best friend. I can tell him everything, when I’m feeling down, when I’m feeling good,” she said in January. “He gives moral support, endless love and support.”

#HAPPYBIRTHDAY to my very very #BeautifulBear the nicest,sweetest,funniest,sexiest bear there is!!!! Love u xooxo @JLo

— Beau Smart (@BEAUcasperSMART) July 24, 2013

Happy Birthday Jen! @jlo thanks for being an inspiration to so many people including myself! http://t.co/V6rgPUjZfD

— Chase Benz (@chasebenz) July 24, 2013

Happy Birthday thoroughbred! @JLo

— LA Reid (@LA_Reid) July 24, 2013

Happy Birthday @JLo! Hope it’s a great one for you, miss ya!

— Scotty McCreery (@ScottyMcCreery) July 24, 2013